Reversing mechanism for drill-presses.



PATBNTED MAY 5, 1903.

H. R. ISLER. REVBRSING MECHANISM FOR DRILL PRESSBS.

APPLIO ATION FILED OCT. 27, 1902.

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. I H. R. ISLER. REVBRSING MECHANISM FOR. DRILL PRESSES.

APPLICATION FILED OCT. 27, 1902.

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UNITED STATES Patented May 5, 1903.

PATENT OFFICE.

HERMAN R. ISLER, OF HAMILTON, OI'II O.

SPECIFICATION forming ar: of Letters Patent No. 727,142, dated May' 5, 1903. Application filezl October 27, 1902., Serial 1%. 128,979. (No man.)

T 00% whom it may concern: 7

Be it known that I, HERMAN R. ISLER, a citizen of the United States,residing at Hamilton, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in ReversingMechanism for Drill- Presses; and I do declare the following to be a full,clear,and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to reversing mechanism for drill-presses.

The object is to provide a simple and effi-. cient reversing mechanism or tapping attachment for drill-presses, whereby in the operation of tapping the machine may be-driven at a slow speed to drive the tap in andreversed at a higher speed to back the tap out, thereby effecting a saving of time and increasing the working capacity of the press.

WVith this object in view the invention consists in certain novel features of construction, combination,and arrangement of parts,which will be hereinafter more fully set forth, and particularly defined in the appended claims.

In the accompanying drawings, Figure 1 is a perspective view of a drill-press embodying my invention. Fig. 2 is a side elevation,

partly in section, of the reversing mechanism.

detached from the press. Fig. 3 is anend elevation of the same. Fig. 4 is aplan view of the reversing-gears and clutch-rings, and Fig 1 5 is a section on line 5 5 of Fig. 4..

Referring to the drawings, 1 denotesthe frame, 2 the rotating tool-spindle, and 3 the drive-shaft, of a drill-press of known .constructiomand 4 denotes the bearing bracket of my reversing mechanism.

The frame 1 is provided with half-bearings a to receive the drive-shaft 3, and which are closed in practice by the usual bearing-capswhich confine theshaft in place.v In apply-.

ing my gearing these caps are removed, and the half-bearings a on the bracket 4 are fitted upon the half-bearings a and secured thereto by bolts or screws 00 By this construction I am enabled to provide reversing gearing which is applicable to any ordinary form of drill-press of the character shown by simply detaching the bearing-caps, as described, andsubstituting a short shaft for the ordinary drive-shaft 3,v so that the shaft 6 may be disposed-in coaxial alinement with said driveshaft', as clearly shown in Fig. 2.

The shaft 3 carries a drive-gear 5 and is disposed in a coaxial alinement with a. powert-ransmitting shaft 6, which carries a bevelpinion 7, meshing with a bevel-gear 8 on the spindle 2, and which has keyed thereto a gear 9 andapinion 10.

11 denotes an intermediate shaft which carries a pinion 12, meshing with the gear 5, whereby it receives motion from the driveshaft 3, and 13 13- d'enote hollowreversinggears loosely mounted on said shaft 11 and adapted when fixed to'said shaft 11 to communicate motion to the shaft 6, one through direct engagement'with the gear 9 and the other through the medium of the pinion l0 and an intermeshing idler 14:, which latter is pivotally mounted so as to be thrown into and out of mesh with the said gear 13 and pinion by means of an eccentric hand-lever 15.

The hollow gears 13 13 are placed side by side to form a-casing or'chamber which receives a shiftable clutch member 16, fitted to 'slide on' shaft 11 and having secured thereto a double wedge-shaped spreader 17, fitting-in correspondingly-shaped slotsl7 in friction-rings 18 18', arranged to normally rotate loosely-in the gears 13 13, but adapted to bespread or expanded to frictionally engage said gears and fix'the same through the said clutch member 16 to the shaft 11. As shown in Figs.'2' and-4:, the spreader 17 is of such lengththat when the clutch member 16 is disposed intermediately of the chamber formed by the two gears 13 13 the ends of the spreader-extend, but partway into the slots 17 and simply hold the friction-gears in their normal operative relation, in-which they turn loosely in the gears, and it will be readily understood therefrom that when the member 16 is moved to the right from its intermediate or neutral position thecoacting end of the spreader will be forced farther into the slot of the ring 18 and expand said ring to clutch the gear 13 to the shaft 11, and that, on the other hand, the movement of the member 16 to the'left from its neutral position will in like manner clutch the gear 13 to the shaft 11. In the neutral position of the member 16 neither ring is expanded, as stated, and hence I both rings rotate with the shaft 11 without turning the gears 13 13'.

The shaft 11 is bored for a portion of its length to receive a sliding shifter bar or rod 19 and formed with a slot 20, receiving a pin on the shiftable clutch member 16, which pin is connected to said bar or red, whereby the movement of said rod in one direction or the other will slide said member 16 to expand ring 18 or ring 18 and clutch gear 13 or 13' to the shaft 11. The outer end of this rod is grooved to receive a fork or an operating-lever 20, said lever being fulcrumed upon an arm 21 to swing in a direction to slide the rod back and forth in shaft 11. A spring-actuated plunger-detent 22, mounted upon the bracket 4, is provided to engage either one of three grooves 23 in the rod to lock the clutch member 16 against casual movement in either one of its three positions.

When the clutch member 16 is in its neutral position the'spindle 2 is at rest, as the motion of the shaft 3 is not transmitted thereto by the interposed gearing. When the clutch is shifted to throw the gear 13' into action, the motion of the shaft 3 will be transmitted to shaft 6, and the latter will be re-- direction to shaft 3 and at a higher rate of speed than before, and the spindle 2 will be revolved faster in the reverse direction.

Hence it will be seen that through one set of gearing the spindle may be revolved at slow speed to drive the tap in and reversed at a higher rate of speed to draw the tap out, thereby enabling the work to be more rapidly done, also that theconstruction of the gearing permits of the stoppage of the spindle at will. When the machine is used for drilling only, the idler lemay be thrown out of mesh with the gears 10 and 13, thus preventing undue wear on the reversing-gearing.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of my invention will be readily apparent, it is thought, without requiring a more extended explanation.

While the preferred embodiment of the invention is as herein shown and described, still the clutch may be made to work exteriorly instead of interiorly, and various other changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Having thus fully described'my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a drill-press, the combination with a drive-shaft and a rotating spindle, of a powertransmitting shaft in coaxial alinement with the drive-shaft and in gear with the spindle,

an intermediate shaft in gear with the drive shaft and in parallel relation to said driveshaft and to the power-transmitting shaft, high andlow speed gearingbetween the powertransmitting and intermediate shafts, and clutch mechanism for throwing the gearing into action to revolve the spindle forwardly at a low rate of speed and rearwardly at a higher rate of speed, substantially as described.

2. In a drill-press, the combination with a frame provided with half-bearings and a rotating spindle, of an attachment comprising abracket provided with complementary halfbearings and fixed to the frame, a drive-shaft and a power-com m unicating shaft disposed in coaxial alinement-and journaled in the halfbearings of the frame and bracket, said powercommunicating shaft being in gear with the spindle, an intermediate shaft disposed in parallel relation to the drive and power-communicating shafts and in gear withthe driveshaft, high and low speed gearing between the power-communicating and intermediate shafts, said gearing comprising two geartrains for communicating forward motion to the spindle at a certain rate of speed and backward motion thereto at a higher rate of speed, and means for throwing either geartrain into action at will, substantially as described.

3. The combination with the frame, the tool-spindle and the drive-shaft of an ordinary drill-press, of an attachment therefor consisting of a bracket applied to the frame and provided with two gear-trains for communicating motion from the drive-shaft to the spindle, one of said gear-trains being adapted to communicate forward motion to the spindle at a certain rate of speed and the other to communicate backward motion to the spindle at a higher rate of speed, and

means for simultaneously throwing one geartrain into and the other out of action, substantially as described.

4. The combination with the frame, the tool-spindle and the drive-shaft of an ordinary drill-press, of an attachment therefor consisting of a bracket applied to the frame, power-transmitting and intermediate shafts carried thereby and in gear respectively with the spindle and the drive-shaft, high and low speed gearing between the said intermediate and power-transmitting shafts consisting'of two gear-trains for communicating motion through said shafts from the drive-shaft to the spindle, one of said gear-trains being adapted to communicate forward motion to the spindle at a certain rate of speed and the other .to communicate backward motion to the spindle at a higher rate of speed, and means for simultaneously throwing one geartrain into and the other out of action, substantiallyas described.

5. In a drill-press, the combination with a frame and tool-spindle, of a drive-shaft and gearing for communicating forward motion from the drive-shaft to the spindle at a certain rate of speed and backward motion from said shaft to said spindle at a higher rate of speed, means for throwing either set of gearing into action at will, and a supportingbracket carrying said gearing and adapted to be attached to and detached from the frame, and when detached to admit of the complete removal of the gearing, substanstantially as described.

6. In a drill-press, the combination of a frame, a tool-spindle, a drive-shaft, a powertransmitting shaft in coaxial alinement with the drive-shaft and in gear with the spindle, an intermediate shaft disposed in parallel relation to the drive and power-transmitting shafts and in gear with the drive-shaft, high and low speed gearing between the powertransmitting and intermediate shafts independently operable for transmitting motion from the drive-shaft to the tool-spindle to operate the latter forwardly at a certain speed or rearwardly at a higher rate of speed, and clutch mechanism for throwing either set of gearing into action at will, substantially as described.

7. In a drill-press, the combination with a supporting-frame, a tool-spindle and a driveshaft, of a power-transmitting shaft in coaxial alinement with the drive-shaft and in gear with the tool-spindle, gears of different diameters on said power-transmitting shaft, an intermediate shaft disposed in parallel relation to the drive and power transmitting shafts and in gear with the drive-shaft, pinions on the intermediate shaft, one of said pinions meshing with the gear of larger diameter on the power-transmitting shaft, an idler connecting the other gear on the intermediate shaft with the gear of smaller diameter on the power-transmitting shaft, and clutch mechanism for throwing either pinion on the intermediate shaft into or out of operation, substantially as described.

8. In a drill-press, the combination of a frame, a tool-spindle, a drive-shaft, a powertransmitting shaft in longitudinal alinement with the drive-shaft and in gear with the spindle, an intermediate shaft disposed in parallel relation to the drive and power-transmitting shafts and in gear with the driveshaft, high and low speed gearing between the intermediate and power-transmitting shafts for driving the tool-spindle forwardly at a certain rate of speed and backward at a higher rate of speed, said gearing comprising two trains of gears including driven gears loosely mounted on the intermediate shaft, clutchrings fixed to the intermediate shaft and disposed within the driven gears and provided with Wedge-shaped slots, and a shiftable member having a wedge-shaped device for expanding either ring to fix either of the said gears to the intermediate shaft, substantially as described.

9. Means for operating the tool-spindle of a drill-press in different directions at different rates of speed comprising a drive-shaft, a power-transmitting shaft and an intermediate shaft in gear with the drive-shaft, reversely-operating trains of high and low speed gearing-between the power-transmitting shaft and intermediate shaft, said gearing including driven gears on the intermediate shaft, friction rings disposed within said driven gears and fixed to the shaft and provided with wedge-shaped slots, a clutch member having a double wedge shaped spreader adapted to engage the slot in either driven gear to fix the same to the intermediate shaft, and a member movable longitudinally within the intermediate shaft for operating said spreader, substantially as described. y In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HERMAN R. IsLER,

Witnesses:

LAURENCE J. GETZ, JAMES R. LOVETT. 

